CH.III THE CHURCH OF SS. SERGIUS AND BACCHUS 63 proceedings of the Synod held at Constantinople in that year,1 According to the Anonymus, indeed, the church and the neighbouring church of SS. Peter and Paul were founded after the massacre in the Hippodrome which suppressed the Nika Riot. But the Anonymus is not a reliable historian.2 The church did not stand alone. Beside it and united with it, Justinian built also a church dedicated to the Apostles Peter and Paul33 so that the two buildings formed a double sanctuary, having a common court and a continuous narthex. They were equal in size and in the richness of the materials employed in their construction, and together formed one of the chief ornaments of the palace and the city. There was, however, one striking difference between them ; SS. Sergius and Bacchus was a domical church, while SS. Peter and Paul was a basilica. Styles of ecclesiastical architecture destined soon to blend together in the grandeur and beauty of S. Sophia were here seen converging towards the point of their union, like two streams about to mingle their waters in a common tide. A similar combination of these styles occurs at Kalat-Seman in the church of S. Symeon Stylites, erected towards the end of the fifth century, where four basilicas forming the arms of a cross are built on four sides of an octagonal court.4 The saints to whom the church was dedicated were brother officers in the Roman army, who suffered death in the reign of Maximianus,5 and Justinian's particular veneration for them was due, it is said, to their interposition in his behalf at a critical moment in his careen Having been implicated, along with his uncle, afterwards Justin L, in a plot against the Emperor Anastasius, he lay under sentence of death for 1 Mansi, viii. col. 1010. 2 Banduri, iii. p. 45. The church was visited by Russian pilgrims in 1200, 1350, 1393.—Itin. russes, pp. 160, 120, 164. 3 Procop. De aed. i. p. 186. S. Peter *near the palace* is mentioned in the list of abbots at the Synod of C.P. in 536. Mansi, viii. col. 930, col. 939. Another document of the same Synod, col. 1010, is signed by Peter, hegoumenos of SS. Peter and Paul and of the holy martyrs SS. Sergius and Bacchus. 4 Diehl, Manuel d'art byxantin, p. 31. Antoniadi has drawn my attention to the junction of a basilica and a hexagonal building in a baptistery at Tivoli. See Dehio und Bezold, Atlas, plate i. fig. 10. 5 Synax, Oct. 7.